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void CMy11111111Dlg::OnLButtonDown(UINT nFlags, CPoint point)  {  // TODO: Add your message handler code here and/or call default  CRect rect(0, 0, 400, 400);  ScreenToClient(rect);  if(PtInRect(rect, point))  {   AfxMessageBox("Success");  }  CDialog::OnLButtonDown(nFlags, point); }
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